Regulated online talk provider bringing in a Parisian (5)
I believe the answer is:
tuned
'regulated online talk' is the definition.
The answer and definition can be both related to change as well as being past participle verbs.
Perhaps you can see an association between them that I don't see?
'provider bringing in a parisian' is the wordplay.
'provider' becomes 'td' (I can't justify this - if you can you should believe this answer much more).
'bringing in' means one lot of letters goes inside another.
'a parisian' becomes 'une' ('a' in French).
'td' placed around 'une' is 'TUNED'.
Can you help me to learn more?
(Other definitions for tuned that I've seen before include "(Of note) adjusted" , "Adjusted (musical) pitch" , "on song" , "Adjusted a radio or engine" , "(Of a piano) properly adjusted" .)